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Search Publications by: Erich N. Grossman (Fed)

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Displaying 26 - 50 of 87

Broaband THz aqueous blackbody calibration source

April 9, 2007
Author(s)
Charles Dietlein, Zoya Popovic, Erich N. Grossman
We describe a broadband calibration source for the millimeter-wave to terahertz (THz) frequency range, the Aqueous Blackbody Calibration (ABC) source. The blackbody in this design is a body of water, which is extremely absorptive at these frequencies, held

Performance comparison of Nb and NbN antenna-coupled microbolometers

April 9, 2007
Author(s)
Charles Dietlein, A. Luukanen, J. S. Penttila, H. Sipola, L. Gronberg, H. Seppa, P. Helisto, Erich N. Grossman
We report the experimental results of a comparison between free-standing Nb and NbN microbolometer bridges coupled to equiangular spiral antennas on Si substrates. Because of the difference in material resistivity, bolometer resistance and aspect ratio is

Spectral decomposition of ultra-wide-band terahertz imagery

April 9, 2007
Author(s)
Erich N. Grossman, Charles Dietlein, Jonathan Chisum, A. Luukanen, J. E. Bjarnason, E. R. Brown
We investigate the spectral response of a THz imaging system based on ultrawideband cryogenic microbolometers. The bandwidth if this system, nominally 0.2 - 1.8 THz, is broad enough to span large variations (>10 dB) in clothing transmittance and

Phenomenology of Passive Broadband Terahertz Images

February 15, 2006
Author(s)
Charles Dietlein, A. Luukanen, Francois Meyer, Zoya Popovic, Erich N. Grossman
Images acquired by a 105-mK noise equivalent temperature difference (NETD) scanned single-pixel broadband 0.1-1 THz passive system are analyzed with two specific parameters of interest in mind. First, the minimum system noise level for clothing feature

Terahertz circular variable filters

February 15, 2006
Author(s)
Erich N. Grossman, Charles Dietlein, A. Luukanen
We describe a novel class of millimeter-wave and terahertz monochrometers based on adiabatically tuned frequency-selective surfaces. They are analogous to the circular-variable filters commonly used in the infrared for low to moderate resolution

Antenna coupled niobium bolometers for 10 (mu)m radiation detection

June 1, 2005
Author(s)
Robert Hadfield, Aaron J. Miller, Sae Woo Nam, Erich N. Grossman, Robert E. Schwall,
We report on the fabrication and testing of antenna-coupled niobium bolometers for 10-micron wavelength radiation detection. We use 20 nm thick Nb films on oxidized Si substrates. The bolometer design consists of a 1 micron x 1 micron Nb microbridge

Holographic microantenna array metrology

May 19, 2005
Author(s)
Erich N. Grossman, Arttu Luukanen, Aaron J. Miller
We describe a holographic or "phaseless" technique for measurement of complex antenna patterns that is particularly suited to planar antennas at very high frequencies -mm-wave thru long-wave infrared -where phase coherent detection is impractical. It has

Near Unity Absorption in Tungsten films

December 19, 2003
Author(s)
Danna Rosenberg, Sae Woo Nam, Aaron J. Miller, Arto Salminen, Erich N. Grossman, Robert E. Schwall, John M. Martinis
The number resolving ability and extremely low dark count rate of tungsten transition-edge sensors (TESs) make them excellent candidates to replace avalanche photo diodes (APDs) in quantum information experiments, including quantum key distribution and

Active millimeter-wave imaging for concealed weapons detection

September 1, 2003
Author(s)
Erich N. Grossman, Aaron J. Miller
Actively illuminated mm-wave imaging systems for concealed weapons detection offer the possibility of much higher sensitivity than with passive systems. We discuss several issues specific to mm-wave imaging systems that are actively illuminated and

NbN Film Development for PHEB Devices

September 1, 2002
Author(s)
Eyal Gerecht, V. A. Bhupathiraju, Erich N. Grossman, Jeffrey W. Nicholson, Fernando Rodriguez-Morales, Dazhen Gu, Sigfrid Yngvesson
We have developed a process for fabricating a thin NbN film at the National Institute of Standards and Technology in Boulder, CO. A two-fold approach can be taken. The first is to maximize the critical temperature of the superconducting device (growing

Noise Temperature for Nb DHEB Mixer Receiver for Far-Infrared Spectroscopy

September 1, 2002
Author(s)
Eyal Gerecht, Carl D. Reintsema, Erich N. Grossman, A. L. Betz, R. T. Boreiko
We are reporting a noise temperature measured on a diffusion-cooled hot electron bolometeric (DHEB) mixer designed for a heterodyne focal plane array to study lines with frequencies of 2 THz and above. Our fabrication process utilizes selective ion milling

Concealed Weapons Detection using an Uncooled Millimeter-wave Microbolometer System

August 1, 2002
Author(s)
Erich N. Grossman, V. A. Bhupathiraju, Aaron J. Miller, Carl D. Reintsema
We describe the status of, and present the first imagery obtained using, an active uncooled mm-wave microbolometer-based imaging system. The microbolometers consist of 2 mm x 6 mm x .02 mm Nb films, coupled to the incident field by annular slot antennas

Controlled Barrier Modification in Nb/NbOx/Ag Metal Insulator Metal Tunnel Diodes

June 15, 2002
Author(s)
Erich N. Grossman, Todd E. Harvey, Carl D. Reintsema
The nonlinear electrical transport properties of metal-insulator-metal (MIM) tunnel diodes based on a barrier of naturally grown niobium oxide have been measured at room temperature and analyzed. In most cases excellent agreement is found between the

First Astronomical Use of Multiplexed Transition Edge Bolometers

February 1, 2002
Author(s)
D. J. Benford, Troy A. Ames, James A. Chervenak, Erich N. Grossman, Kent D. Irwin, S. A. De Kotwara, B. Maffci, S. H. Mosely, Francois Pajot, Thomas G. Phillips, Carl D. Reintsema, Cyrille Rioux, Rick A. Shafer, Johannes G. Staguhn, C. Vastel, George M. Voellmer
We present performance results based on the first astronomical use of mutiplexed superconducting bolometers. The Fabry-Perot Interferometer Bolometer Research Experiment (FIBRE) is a broadband submillimeter spectrometer that achieved first light in June

Time-Division SQUID Multiplexers

February 1, 2002
Author(s)
Kent D. Irwin, Leila R. Vale, Norman F. Bergren, Steven Deiker, Erich N. Grossman, Gene C. Hilton, John M. Martinis, Sae Woo Nam, Carl D. Reintsema, David A. Rudman, Martin Huber
SQUID multiplexers (MUX) make is possible to build arrays of thousands of low-temperature bolometers and microcalorimeters based on superconducting transition-edge sensors (TES) with a manageable number of readout channels. We discuss the technical

TES Detector Noise Limited Readout Using SQUID Multiplexers

January 1, 2002
Author(s)
Johannes G. Staguhn, C. A. Allen, D. J. Benford, James A. Chervenak, M. M. Freund, S. A. Khan, A. S. Kutyrev, S. H. Mosely, Rick A. Shafer, Steven Deiker, Erich N. Grossman, Gene C. Hilton, Kent D. Irwin, John M. Martinis, Sae Woo Nam, David A. Rudman, David A. Wollman
The availability of superconducting Transition Edge Sensors (TES) with large numbers of individual detector pixels requires multiplexers for efficient readout. The usage of multiplexers limits the number of wires needed between the cryogenic electronics

Design of an Active MM-Wave Concealed Object Imaging System

August 1, 2001
Author(s)
Nicholas Paulter, Erich N. Grossman, Gerard N. Stenbakken, Bryan C. Waltrip, Shalva Nolen, Carl D. Reintsema
The research and design of an active millimeter-wave concealed object imaging system is described. Several illumination and detection methods were analyzed via computer simulation to assess the effects of system parameters on the signal-to-noise ratio of

Properties of Cavity-Backed Slot-Ring Antennas at 95 GHZ

August 1, 2001
Author(s)
Shalva Nolen, Todd E. Harvey, Carl D. Reintsema, Erich N. Grossman
Slot-ring antennas with planar backshorts, designed for operation at 95 GHz, have been fabricated and their properties measured. Using optical lithography, we fabricated the slot-ring antennas, along with integrated niobium thin-film biolometers, on

Sub-Picowatt Precision Radiometry Using Superconducting Transition Edge Sensor Bolometers

March 1, 2001
Author(s)
James A. Chervenak, Erich N. Grossman, Carl D. Reintsema, Kent D. Irwin, S. H. Mosely, C. A. Allen
We describe a cryogenic radiometric calibration system suitable for high sensitivity, low power bolometers. The system uses a variable temperature blackbody source capable of temperatures of 4-20 K, whose output covers the sub-millimeter wavelength regime